package com.lin.boot05webadmin.interceptor;

import org.springframework.http.server.reactive.ContextPathCompositeHandler;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.sql.PreparedStatement;

/**拦截器
 * 登录检查
 * 1.配好拦截器要拦截哪些请求
 * 2.把这些配置放在容器中
 *
 * @author ChenweiLin
 * @create 2021-04-02 22:37
 */
public class LoginInterceptor implements HandlerInterceptor {

    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登录检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");

        if (loginUser != null){
            //放行
            return true;
        }

        //拦截住。 未登录。 跳转到登录页
        request.setAttribute("msg", "请先登录");
//        response.sendRedirect("/");
        request.getRequestDispatcher("/").forward(request, response);
        return false;
    }

    /**
     * 目标方法执行完成之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * 页面渲染之后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
